ps:最近用vc作遥感影像的入库功能，借助GDAL来做，基本已经可以使用了。最后要写段代码对建立好的金字塔作合并输出，再次翻看了gdal_merge.py，其实这段代码很早就看过，尽管道理不复杂，但看到Frank把代码写的这么精致，不由肃然起敬，放到这里经常来看看勉励自己。
写代码有好几年了，现在才深刻体会到软件设计模式、架构、文档、规范的重要性，反而感觉做工作时有些瞻前顾后，总想把代码的逻辑整的很清晰以提高可维护行和复用性，真是那个 阶段有哪个阶段的烦恼，呵呵！
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!/usr/bin/env python
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##############################################################################
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$Id: gdal_merge.py,v 1.25 2006/04/20 13:27:57 fwarmerdam Exp $
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Project: InSAR Peppers
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Purpose: Module to extract data from many rasters into one output.
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Author: Frank Warmerdam, warmerdam@pobox.com
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##############################################################################
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Copyright (c) 2000, Atlantis Scientific Inc. (www.atlsci.com)
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the
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Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA.
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##############################################################################
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$Log: gdal_merge.py,v $
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Revision 1.25 2006/04/20 13:27:57 fwarmerdam
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Added error checks on Driver's Create support and success of Create.
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Revision 1.24 2006/01/26 23:40:39 fwarmerdam
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treat nodata as a float.
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Revision 1.23 2005/11/25 02:13:36 fwarmerdam
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Added --help-general.
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Revision 1.22 2005/11/16 18:30:49 fwarmerdam
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Fixed round off issue with output file size.
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Revision 1.21 2005/08/18 15:45:15 fwarmerdam
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Added the -createonly switch.
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Revision 1.20 2005/07/19 03:33:39 fwarmerdam
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removed left over global_list
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Revision 1.19 2005/06/23 19:51:51 fwarmerdam
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Fixed support for non-square pixels c/o Matt Giger
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http://bugzilla.remotesensing.org/show_bug.cgi?id=874
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Revision 1.18 2005/03/29 22:40:00 fwarmerdam
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Added -ot option.
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Revision 1.17 2005/02/23 18:29:07 fwarmerdam
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Accept "either spelling" of separate.
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Revision 1.16 2005/02/23 18:23:00 fwarmerdam
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Added -seperate to the usage message.
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Revision 1.15 2004/09/02 22:06:24 warmerda
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Added a bit of commandline error reporting.
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Revision 1.14 2004/08/23 15:05:27 warmerda
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Added projection setting for new files.
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Revision 1.13 2004/04/02 22:31:26 warmerda
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Use -of for format.
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Revision 1.12 2004/04/02 17:40:44 warmerda
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added GDALGeneralCmdLineProcessor() support
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Revision 1.11 2004/03/26 17:11:42 warmerda
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added -init
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Revision 1.10 2003/04/22 14:42:45 warmerda
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Don't import Numeric unless we need it.
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Revision 1.9 2003/04/22 13:30:05 warmerda
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Added -co flag.
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Revision 1.8 2003/03/07 16:26:39 warmerda
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fixed up for ungeoreferenced files, supress extra error
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Revision 1.7 2003/01/28 15:00:13 warmerda
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applied patch for multi-band support from Ken Boss
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Revision 1.6 2003/01/20 22:19:08 warmerda
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added nodata support
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Revision 1.5 2002/12/12 14:54:42 warmerda
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added the -pct flag to copy over a pct
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Revision 1.4 2002/12/12 14:48:12 warmerda
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removed broken options arg to gdal.Create()
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Revision 1.3 2002/04/03 21:12:05 warmerda
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added -separate flag for Gerald Buckmaster
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Revision 1.2 2000/11/29 20:36:18 warmerda
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allow output file to be preexisting
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Revision 1.1 2000/11/29 20:23:13 warmerda
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